"I have never committed any type of child porn, never distributed, never sought it," he wrote. "I may be a sick murderer, but that headline hurt."

In the plea deal, prosecutors agreed to remove the child pornography charge in exchange for guilty pleas to two counts of second-degree murder and arson. Dion was sentenced to 60 years to life in prison.

"Another break in the case was the recovery of the stolen Nissan Altima out of New Hampshire," Murano said. "That was in St. Petersburg, Florida."

That was another clue for investigators. Soon after, Dion, who went by the name Cameron while he was on the run, burned a bridge with a family in Florida who had taken him in. He stole a car, a handgun and cash and fled.

During the interview, the Manchester detectives tried to keep the focus on what happened on the day Dion set the house on fire.

"I didn't even feel the guilt of what I did to my parents," he said. "I felt the guilt of what if one of those (firefighters) got hurt."

Dion was referring to the images he saw online of the massive explosion on Mooresville Road that blew the house off the foundation.

"The highlight of the day was I had put gasoline everywhere," he said. "I had gasoline in the kitchen, and I threw the match, and I went to go open the door. … Literally, the flames in the kitchen were up into the ceiling and into the porch."

He had killed his parents five days before the fire. Dion refused to say out loud how he killed them, but he wrote it out on a piece of paper.

"I used a piano string cordage on my father attached to a bolt and a screwdriver for grip," he wrote. "After a brief struggle, I used a metal folding chair to strike blows to his head. I strangled my mother at the kitchen table with a green, thick wire spool from the basement."

Murano created the wanted posters that were posted across the country during the search for Dion. The sign was crafted to communicate with the public and stroke the suspect's ego.

"In our hunt for him, we were advertising him as a pretty intellectual individual who could play the piano and speak French and was interested in the fine arts, in museums and photography," Murano said. "But at the end of the day, he was just another fugitive who had committed some pretty heinous offenses, and he made a decision that led him to being arrested, so how smart was he really?"

When Dion was placed on the 15 most wanted fugitive list, the reward money for information leading to his arrest jumped to $25,000. The U.S. marshals said that reward was split among three tipsters who provided critical information the led to Dion's capture at the Astoria Hotel in Florida.